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It is known to all that the earth is round.这句话属于什么句型?

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It is known to all that the earth is round.这句话属于什么句型?
It is known to all that the earth is round.
这句话属于什么句型?
为什么?
It is known to all that the earth is round.这句话属于什么句型?
众所周知,地球是圆的.
it是形式主语.作为形式主语的it并无实际语义,只是为满足语法上的需要,避免句子头重脚轻,它代替的是句子的逻辑主语.这句话真正的主语是"the earth is round"